Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 71: Correlated Electrons: Poster Session

TT 71.56: Poster

Mittwoch, 18. März 2015, 15:00–18:00, Poster B

Field-dependent de Haas-van Alphen frequencies in the non-centrosymmetric compound CrGe — •J. Klotz1,2, K. Götze1,2, J. Bruin3, C. Geibel4, H. Rosner4, K. Weber4, M. Schmidt4, and J. Wosnitza1,21Hochfeld-Magnetlabor, Helmholtz-Zentrum Dresden-Rossendorf, Germany — 2Institut für Festkörperphysik, TU Dresden, Germany — 3High Magnetic Field Laboratory, Radboud University, Netherlands — 4Max-Planck-Institut für Chemische Physik fester Stoffe, Dresden, Germany

CrGe is a transition-metal germanide with the B20 non-centrosymmetric cubic structure. It does not exhibit any magnetic order in fields up to 60 T but the temperature dependence of the susceptibility and resistivity indicate its proximity to ferromagnetism [1]. Since CrGe has no inversion symmetry, it was expected to exhibit anti-symmetric spin-orbit interaction with split dHvA frequencies which are field dependent [2]. We present dHvA-effect data that were obtained employing rotatable capacitive torque magnetometers in a 18 T/30 mK and a 33 T/340 mK system. We found a clear field dependence of the dHvA frequencies as well as enlarged effective masses as was expected from the enhanced Sommerfeld coefficient of γ = 19 mJ/mol K2

[1] T. Sato and M. Sakata, J. Phys. Soc. Jpn. 52 (1983), 1807

[2] V. P. Mineev and K. V. Samokhin, Phys. Rev. B 72 (2005), 212504.

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